What is the normal vision, the range of normal vision_Industry News_
In the visual inspection, different visual acuity charts can be seen, and the general visual acuity is sometimes expressed differently. Therefore, some people do not quite understand the normal visual acuity, and because some children are still in the growth and development stage, they The normal vision is also staged. So, what is the normal vision and what is the range of the normal vision? Let’s take a look at it together. At present, the main methods for expressing vision in China are to use decimal and logarithmic records. These two recording methods can be converted. Normally, the naked eye vision reaches 1.0 or 5.0, which is called normal vision. If the visual acuity is lower than this standard, there may be visual problems, including nearsightedness, farsightedness, etc., which need to be corrected. Generally speaking, if normal vision cannot be achieved through glasses correction, a comprehensive examination is required. Some refractive errors may have amblyopia. No matter what kind of eye chart, their principles are the same. Vision refers to how far away things can be seen under the premise of 1 point of view. Generally, the vision that can be seen clearly at 1.0 or 5.0 under 1 point of view is classified as normal vision. Because the individual's smaller visual threshold is different, the vision is also different. Therefore, some people have better vision than 1.0 or 5.0. For children, the visual acuity of a child is usually 0.2 when they are 1 year old, and the visual acuity increases by about 0.2 for each year of age. When a child is 5 years old, his vision must be above 1.0, when he is 8 years old, his vision must be 2.0, and after 14 years his vision must be about 3.0.